<?php
/*
======================================================================
lastRSS 0.9.1

Simple yet powerfull PHP class to parse RSS files.

by Vojtech Semecky, webmaster @ webdot . cz

Latest version, features, manual and examples:
http://lastrss.webdot.cz/

----------------------------------------------------------------------
LICENSE

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License (GPL)
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

To read the license please visit http://www.gnu.org/copyleft/gpl.html
======================================================================
*/

/**
* lastRSS
* Simple yet powerfull PHP class to parse RSS files.
*/

class Rss
{
	// -------------------------------------------------------------------
	// Private properties
	// -------------------------------------------------------------------
	private $default_cp 	= 'UTF-8';
	private $CDATA 			= 'strip';
	private $cp 			= 'UTF-8';
	private $items_limit 	= 0;
	private $stripHTML 		= false;
	private $date_format 	= 'Y-m-d';
	private $cache_dir		= '';
	// -------------------------------------------------------------------
	// Private variables
	// -------------------------------------------------------------------
	private $channeltags 	= array ('title', 'link', 'description', 'language', 'copyright', 'managingEditor', 'webMaster', 'lastBuildDate', 'rating', 'docs');
	private $itemtags 		= array('title', 'link', 'description', 'author', 'category', 'comments', 'enclosure', 'guid', 'pubDate', 'source');
	private $imagetags 		= array('title', 'url', 'link', 'width', 'height');
	private $textinputtags 	= array('title', 'description', 'name', 'link');
	// -------------------------------------------------------------------
	// Private variables
	// -------------------------------------------------------------------
	private $rsscp			= '';
	/**
	 * 构造函数
	 */
	public function __construct()
	{
		$this->config = Configure::item_array();
	}
	public function set($array)
	{

	}
	// -------------------------------------------------------------------
	// Parse RSS file and returns associative array.
	// -------------------------------------------------------------------
	public function get($rss_url)
	{
		// If CACHE ENABLED
		if (!empty($this->cache_dir))
		{
			$cache_file = $this->cache_dir . '/rsscache_' . md5($rss_url);
			$timedif 	= @(time() - filemtime($cache_file));

			if ($timedif < $this->cache_time)
			{
				// cached file is fresh enough, return cached array
				$result = unserialize(join('', file($cache_file)));
				// set 'cached' to 1 only if cached file is correct
				if ($result)
				{
					$result['cached'] = 1;
				}
			}
			else
			{
				// cached file is too old, create new
				$result 	= $this->Parse($rss_url);
				$serialized = serialize($result);
				if ($f = @fopen($cache_file, 'w'))
				{
					fwrite ($f, $serialized, strlen($serialized));
					fclose($f);
				}
				if ($result)
				{
					$result['cached'] = 0;
				}
			}
		}
		else // If CACHE DISABLED >> load and parse the file directly
		{
			$result = $this->Parse($rss_url);
			if ($result)
			{
				$result['cached'] = 0;
			}
		}
		// return result
		return $result;
	}
	// -------------------------------------------------------------------
	// Modification of preg_match(); return trimed field with index 1
	// from 'classic' preg_match() array output
	// -------------------------------------------------------------------
	private function my_preg_match ($pattern, $subject)
	{
		// start regullar expression
		@preg_match($pattern, $subject, $out);
		// if there is some result... process it and return it
		if(isset($out[1]))
		{
			// Process CDATA (if present)
			if ($this->CDATA == 'content')
			{ // Get CDATA content (without CDATA tag)
				$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
			}
			elseif ($this->CDATA == 'strip')
			{ // Strip CDATA
				$out[1] = strtr($out[1], array('<![CDATA['=>'', ']]>'=>''));
			}
			// If code page is set convert character encoding to required
			if ($this->cp != '')
			{
				$out[1] = iconv($this->rsscp, $this->cp.'//TRANSLIT', $out[1]);
			}
			// Return result
			return trim($out[1]);
		}
		else
		{
			// if there is NO result, return empty string
			return '';
		}
	}

	// -------------------------------------------------------------------
	// Replace HTML entities &something; by real characters
	// -------------------------------------------------------------------
	private function unhtmlentities ($string)
	{
		// Get HTML entities table
		$trans_tbl = get_html_translation_table (HTML_ENTITIES, ENT_QUOTES);
		// Flip keys<==>values
		$trans_tbl = array_flip ($trans_tbl);
		// Add support for &apos; entity (missing in HTML_ENTITIES)
		$trans_tbl += array('&apos;' => "'");
		// Replace entities by values
		return strtr ($string, $trans_tbl);
	}

	// -------------------------------------------------------------------
	// Parse() is private method used by Get() to load and parse RSS file.
	// Don't use Parse() in your scripts - use Get($rss_file) instead.
	// -------------------------------------------------------------------
	private function Parse ($rss_url)
	{
		// Open and load RSS file
		if ($rss_content = file_get_contents($rss_url))
		{
			// Parse document encoding
			$result['encoding'] = $this->my_preg_match("'encoding=[\'\"](.*?)[\'\"]'si", $rss_content);
			// if document codepage is specified, use it
			if ($result['encoding'] != '')
			{
				$this->rsscp = $result['encoding'];
			}
			else // This is used in my_preg_match() // otherwise use the default codepage
			{
				$this->rsscp = $this->default_cp;
			} 
			// This is used in my_preg_match()
			// Parse CHANNEL info
			preg_match("'<channel.*?>(.*?)</channel>'si", $rss_content, $out_channel);
			if (empty($out_channel[1])) 
			{
				return die('错误的rss url');
			}
			
			foreach($this->channeltags as $channeltag)
			{
				$temp = $this->my_preg_match("'<$channeltag.*?>(.*?)</$channeltag>'si", $out_channel[1]);
				if ($temp != '')
				{
					$result[$channeltag] = $temp; // Set only if not empty
				}
			}
			// If date_format is specified and lastBuildDate is valid
			if ($this->date_format != '' && ($timestamp = @strtotime($result['lastBuildDate'])) !==-1)
			{
				// convert lastBuildDate to specified date format
				$result['lastBuildDate'] = date($this->date_format, $timestamp);
			}
			// Parse TEXTINPUT info
			preg_match("'<textinput(|[^>]*[^/])>(.*?)</textinput>'si", $rss_content, $out_textinfo);
			// This a little strange regexp means:
			// Look for tag <textinput> with or without any attributes, but skip truncated version <textinput /> (it's not beggining tag)
			if (isset($out_textinfo[2]))
			{
				foreach($this->textinputtags as $textinputtag)
				{
					$temp = $this->my_preg_match("'<$textinputtag.*?>(.*?)</$textinputtag>'si", $out_textinfo[2]);
					if ($temp != '')
					{
						$result['textinput_'.$textinputtag] = $temp; // Set only if not empty
					}
				}
			}
			// Parse IMAGE info
			preg_match("'<image.*?>(.*?)</image>'si", $rss_content, $out_imageinfo);
			if (isset($out_imageinfo[1]))
			{
				foreach($this->imagetags as $imagetag)
				{
					$temp = $this->my_preg_match("'<$imagetag.*?>(.*?)</$imagetag>'si", $out_imageinfo[1]);
					if ($temp != '')
					{
						$result['image_'.$imagetag] = $temp; // Set only if not empty
					}
				}
			}
			// Parse ITEMS
			preg_match_all("'<item(| .*?)>(.*?)</item>'si", $rss_content, $items);
			$rss_items 			= $items[2];
			$i 					= 0;
			$result['items'] 	= array(); // create array even if there are no items
			foreach($rss_items as $rss_item)
			{
				// If number of items is lower then limit: Parse one item
				if ($i < $this->items_limit || $this->items_limit == 0)
				{
					foreach($this->itemtags as $itemtag)
					{
						$temp = $this->my_preg_match("'<$itemtag.*?>(.*?)</$itemtag>'si", $rss_item);
						if ($temp != '')
						{
							$result['items'][$i][$itemtag] = $temp; // Set only if not empty
						}
					}
					// Strip HTML tags and other bullshit from DESCRIPTION
					if ($this->stripHTML && $result['items'][$i]['description'])
					{
						$result['items'][$i]['description'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['description'])));
					}
					// Strip HTML tags and other bullshit from TITLE
					if ($this->stripHTML && $result['items'][$i]['title'])
					{
						$result['items'][$i]['title'] = strip_tags($this->unhtmlentities(strip_tags($result['items'][$i]['title'])));
					}
					// If date_format is specified and pubDate is valid
					if ($this->date_format != '' && ($timestamp = strtotime($result['items'][$i]['pubDate'])) !==-1) {
						// convert pubDate to specified date format
						{
							$result['items'][$i]['pubDate'] = date($this->date_format, $timestamp);
						}
					}
					// Item counter
					$i++;
				}
			}
			$result['items_count'] = $i;
			return $result;
		}
		else // Error in opening return False
		{
			return False;
		}
	}
}
// +--------------------------------------------------------------------------
// |   Last Modified By BoPo
// |   Date: Sun Dec 09 15:58:17 CST 2007
// +--------------------------------------------------------------------------
?>